In the US, the Computer Fraud and Abuse Act outlaws unauthorized access to computer systems. “Unauthorized” has sometimes been interpreted to include terms of s

In the US, the Computer Fraud and Abuse Act outlaws unauthorized access to computer systems. “Unauthorized” has sometimes been interpreted to include terms of service violations. So if their click-through agreement nobody reads says you’re only allowed to use their official app to access the service, using a third party app to access it may be criminal.